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Abstract

This study aimed first to clarify the distribution and diurnal variability of Mesoscale Convective System (MCS) occurences and their relations to the in-situ records of heavy rain events in the SW area including complex topography such as the Sichuan Basin,the Yun-qui Plateau, and the Qinling Mountains). The second aim was to characterize the synoptic pattern and formation mechanisms from the viewpoint of the prevailing MCS formation areas. One key issue is to reveal the structure of the development of a mid-troposphere shortwave coupled with diurnal local circulations